A helicopter gunship pulls out of an attack in the Mekong Delta during Speedy Express, January 1969.

By the mid-1960s, the Mekong Delta, with its verdant paddies and canal-side hamlets, was the rice bowl of South Vietnam and home to nearly 6 million Vietnamese. It was also one of the most important revolutionary strongholds during the Vietnam War. Despite its military significance, State Department officials were "deeply concerned" about introducing a large number of US troops into the densely populated area, fearing that it would be impossible to limit civilian carnage.

Yet in late 1968, as peace talks in Paris got under way in earnest, US officials launched a "land rush" to pacify huge swaths of the Delta and bring the population under the control of the South Vietnamese government in Saigon. To this end, from December 1968 through May 1969, a large-scale operation was carried out by the Ninth Infantry Division, with support from nondivision assets ranging from helicopter gunships to B-52 bombers. The offensive, known as Operation Speedy Express, claimed an enemy body count of 10,899 at a cost of only 267 American lives. Although guerrillas were known to be well armed, the division captured only 748 weapons.

In late 1969 Seymour Hersh broke the story of the 1968 My Lai massacre, during which US troops slaughtered more than 500 civilians in Quang Ngai Province, far north of the Delta. Some months later, in May 1970, a self-described "grunt" who participated in Speedy Express wrote a confidential letter to William Westmoreland, then Army chief of staff, saying that the Ninth Division's atrocities amounted to "a My Lay each month for over a year." In his 1976 memoir A Soldier Reports, Westmoreland insisted, "The Army investigated every case [of possible war crimes], no matter who made the allegation," and claimed that "none of the crimes even remotely approached the magnitude and horror of My Lai." Yet he personally took action to quash an investigation into the large-scale atrocities described in the soldier's letter...

Nick Turse is an award-winning journalist, historian, essayist, and the associate editor of The Nation Institute's TomDispatch. He is the author of The Complex: How the Military Invades Our Everyday Lives and the editor of The Case for Withdrawal from Afghanistan. Turse was the recipient of a...

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